const mongoose = require("mongoose");

// 连接mongodb数据库管理系统，并选择数据库
mongoose.connect("mongodb://127.0.0.1:27017/wangyi");

mongoose.connection.on("connected", ()=>{
    console.log("连接成功")
})
mongoose.connection.on("error", ()=>{
    console.log("连接失败")
})
mongoose.connection.on("disconnected", ()=>{
    console.log("连接断开")
})

// 暴露mongoose对象
module.exports = mongoose;